<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="vue.js"></script>

</head>
<body>
    <div id="app">
        <input type="text" v-model="message" style="width: 350px;height:30px;" >
        
        <button v-on:click="handleBtnClick">点击</button>
        <p>您输入的是：{{message}}</p>
        <textarea v-model="sum" style="width: 350px;height:30px;"></textarea>
    </div>

    <script>
        var app=new Vue({
            el:"#app",
            data:{
                message:"",
                sum:""
            },
            methods:{
                handleBtnClick:function(){
                    this.sum=this.sum+this.message+'\n'
                }
            }
        })
    </script>


</body>
</html>